Method callback

Lib/test/test_tkinter/test_misc.py:137–139

(start=0, step=1, *, end=0)

        root = self.root

        def callback(start=0, step=1, *, end=0):
            nonlocal count
            count = start + step + end

        # Without function, sleeps for ms.
        self.assertIsNone(root.after(1))